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Audrey had some $10 notes and Sean had some $20 notes.
The ratio of the number of Audrey's notes to the number of Sean's notes was 4 : 3.
After Audrey gave Sean 16 notes, this ratio became 2 : 5.
(a) How many $20 notes did Sean have at first?
(b) Find the total value of all the notes which Sean and Audrey had.
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